Article Per Year (5 Year)
p-Index From 2021 - 2026
3.143
P-Index
This Author published in this journals
All Journal ROTOR: JURNAL ILMIAH TEKNIK MESIN Turbo : Jurnal Program Studi Teknik Mesin STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Wave: Jurnal Ilmiah Teknologi Maritim ComTech: Computer, Mathematics and Engineering Applications Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Mechanical Engineering for Society and Industry JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI WAVE: Jurnal Ilmiah Teknologi Maritim Energy: Jurnal Ilmiah Ilmu-ilmu Teknik
Robertus Sidartawan
Department Of Mechanical Engineering, University Of Jember, 68121, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation

Published : 21 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 21 Documents
Search

 1   2   3 
Nonlinear Trade-Off Between Agitator Speed and Biodiesel Quality in Transesterification: A Lab-Scale Study Dani Hari Tunggal Prasetiyo; Danang Yudistiro Danang; Robertus Sidartawan Robertus; Iqbal Ramadhani Iqbal; Asroful Abidin Asroful Abidin
ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK Vol. 16 No. 1 (2026): ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK (January-May 2026 Edition)
Publisher : Universitas Panca Marga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51747/energy.v16i1.1615

Abstract

The agitator speed controls the intensity of interaction between the immiscible oil and methanol phases during transesterification. This, in turn, shapes the overall reaction environment during the biodiesel production process. While higher agitation rates are often associated with increased mass transfer, their impact on the resulting fuel properties is not always proportional. In a controlled laboratory setting, the effect of agitator speed was examined at 300, 500, 700, and 900 rpm, with particular attention paid to biodiesel yield, density, kinematic viscosity, and flash point. A gradual shift in system behavior became apparent as the agitation rate increased. In the intermediate range of 500–700 rpm, the process tended to stabilize, producing biodiesel with relatively consistent characteristics. The measured kinematic viscosity was between 4.42 and 4.45 cSt, accompanied by a density of approximately 861 kg/m³. However, pushing the system to higher agitation rates led to a different response. At 900 rpm, the yield dropped sharply to 49.53%, and the viscosity increased to 4.92 cSt. This behavior indicates the onset of unfavorable hydrodynamic conditions, where intensive mixing likely disrupts phase separation and promotes the formation of a stable emulsion. Meanwhile, the flash point continued to increase from 124.7 °C to 166.8 °C, indicating a progressive decrease in residual methanol. Overall, these observations suggest that the influence of stirrer speed is governed by competing mechanisms rather than a simple monotonic trend. Operation in the 500–700 rpm range appears to offer a more reliable compromise, where conversion and fuel properties remain balanced. From an engineering perspective, this range provides a useful reference for establishing operating conditions in biodiesel reactors, especially when considering process development beyond the laboratory scale while maintaining consistent product quality.
Co-Authors Agus Triono Ahmad Adib Rosyadi Ahmad Syuhri Ahmad Wafi Andi Sanata Asroful Abidin Asroful Abidin Asroful Abidin Danang Yudistiro Dani Hari Tunggal Prasetiyo Dedi Dwilaksana Dinata, Fadea Dwi Djumhariyanto Dwi Hidayatul Qoryah, Rika Dwiqoryah, Rika ERICHA DWI WAHYU SYAH PUTRI Gaguk Jatisukamto Gindeka Bimara Aryantaka Haidzar Nurdiansyah Hari Arbiantara Basuki Hary Sutjahjono Imam Sholahuddin Intan Hardiatama Iqbal Ramadhani Iqbal Jamil, Farur K.W., Robertoes Koekoeh Kristianta, Franciscus Xaverius Kristianta, FX Linda Kurnia Supraptiningsih Listiyadi, Digdo Mahros Darsin Mochamad Asrofi Mochamad Edoward Ramadhan Muhammad Asrofi, Muhammad Muhammad Dimyati Nashrullah Muhammad Wildan Nashrullah, M. Dimyati Nisak, Rima Zidni Karimatan Prasetio, Dwi Angga Tary Puranggo Ganjar Widityo Rahma Rei Sakura Raihaan . Ramli Firdaus Kusnadi Rizky Akhmad Prayogi Rozy, M. Fahrur Salahuddin Junus Samsuri . Sholahudin, Imam Stujanjono, Hary Sumarji Susanti, Rizqa Putri Trifiananto, M Trifiananto, Muhammad Wiyono, Pandu Akbar Iqrofasya Wiyono Yasim, Ahmad Yudah, Norman Audi Erlangga Pradipta Yudhistiro, Danang Yuni Hermawan